diff --git a/package.json b/package.json
index 56d94c86a8..d023f34f3e 100644
--- a/package.json
+++ b/package.json
@@ -187,6 +187,7 @@
     "nightwatch_local_editor": "nightwatch ./test-browser/tests/editor.test.js --config nightwatch.js --env chrome ",
     "nightwatch_local_compiler": "nightwatch ./test-browser/tests/compiler_api.test.js --config nightwatch.js --env chrome ",
     "nightwatch_local_txListener": "nightwatch ./test-browser/tests/txListener.test.js --config nightwatch.js --env chrome ",
+    "nightwatch_local_fileManager": "nightwatch ./test-browser/tests/fileManager_api.test.js --config nightwatch.js --env chrome ",
     "nightwatch_local_runAndDeploy": "nightwatch ./test-browser/tests/runAndDeploy.js --config nightwatch.js --env chrome-runAndDeploy ",
     "onchange": "onchange build/app.js -- npm-run-all lint",
     "prepublish": "mkdirp build; npm-run-all -ls downloadsolc_root build",
diff --git a/src/app/files/fileManager.js b/src/app/files/fileManager.js
index fe74117a3a..6699179c06 100644
--- a/src/app/files/fileManager.js
+++ b/src/app/files/fileManager.js
@@ -23,7 +23,7 @@ const profile = {
   icon: 'assets/img/fileManager.webp',
   permission: true,
   version: packageJson.version,
-  methods: ['file', 'exists', 'open', 'writeFile', 'readFile', 'copyFile', 'rename', 'readdir', 'remove', 'getCurrentFile', 'getFile', 'getFolder', 'setFile', 'switchFile'],
+  methods: ['file', 'exists', 'open', 'writeFile', 'readFile', 'copyFile', 'rename', 'mkdir', 'readdir', 'remove', 'getCurrentFile', 'getFile', 'getFolder', 'setFile', 'switchFile'],
   kind: 'file-system'
 }
 const errorMsg = {
@@ -194,10 +194,24 @@ class FileManager extends Plugin {
    * @returns {void}
    */
   async rename (oldPath, newPath) {
-    await this.__handleExists(oldPath, `Cannot rename ${oldPath}`)
+    await this._handleExists(oldPath, `Cannot rename ${oldPath}`)
     const isFile = await this.isFile(oldPath)
+    const newPathExists = await this.exists(newPath)
+    const provider = this.fileProviderOf(oldPath)
 
-    this.fileRenamedEvent(oldPath, newPath, !isFile)
+    if (isFile) {
+      if (newPathExists) {
+        modalDialogCustom.alert('File already exists.')
+        return
+      }
+      return provider.rename(oldPath, newPath, false)
+    } else {
+      if (newPathExists) {
+        modalDialogCustom.alert('Folder already exists.')
+        return
+      }
+      return provider.rename(oldPath, newPath, true)
+    }
   }
 
   /**
diff --git a/test-browser/tests/fileManager_api.test.js b/test-browser/tests/fileManager_api.test.js
new file mode 100644
index 0000000000..681d354d2b
--- /dev/null
+++ b/test-browser/tests/fileManager_api.test.js
@@ -0,0 +1,190 @@
+'use strict'
+var init = require('../helpers/init')
+var sauce = require('./sauce')
+
+module.exports = {
+  before: function (browser, done) {
+    init(browser, done)
+  },
+
+  'Should execute `file` api from file manager external api': function (browser) {
+    browser
+    .addFile('file.js', { content: executeFile })
+    .executeScript(`remix.exeCurrent()`)
+    .pause(2000)
+    .journalLastChildIncludes('browser/file.js')
+  },
+
+  'Should execute `exists` api from file manager external api': function (browser) {
+    browser
+    .addFile('exists.js', { content: executeExists })
+    .executeScript(`remix.exeCurrent()`)
+    .pause(2000)
+    .journalChildIncludes('browser/exists.js true')
+    .journalChildIncludes('browser/non-exists.js false')
+  },
+
+  'Should execute `open` api from file manager external api': function (browser) {
+    browser
+    .addFile('open.js', { content: executeOpen })
+    .executeScript(`remix.exeCurrent()`)
+    .pause(2000)
+    .journalLastChildIncludes('browser/3_Ballot.sol')
+  },
+
+  'Should execute `writeFile` api from file manager external api': function (browser) {
+    browser
+    .addFile('writeFile.js', { content: executeWriteFile })
+    .executeScript(`remix.exeCurrent()`)
+    .pause(2000)
+    .openFile('browser/new_contract.sol')
+    .assert.containsText('[data-id="editorInput"]', 'pragma solidity ^0.6.0')
+  },
+
+  'Should execute `readFile` api from file manager external api': function (browser) {
+    browser
+    .addFile('readFile.js', { content: executeReadFile })
+    .executeScript(`remix.exeCurrent()`)
+    .pause(2000)
+    .journalLastChildIncludes('pragma solidity ^0.6.0')
+  },
+
+  'Should execute `copyFile` api from file manager external api': function (browser) {
+    browser
+    .addFile('copyFile.js', { content: executeCopyFile })
+    .executeScript(`remix.exeCurrent()`)
+    .pause(2000)
+    .journalLastChildIncludes('pragma solidity >=0.2.0 <0.7.0;')
+  },
+
+  'Should execute `rename` api from file manager external api': function (browser) {
+    browser
+    .addFile('renameFile.js', { content: executeRename })
+    .executeScript(`remix.exeCurrent()`)
+    .pause(2000)
+    .waitForElementPresent('[data-id="treeViewLibrowser/old_contract.sol"]')
+  },
+
+  'Should execute `mkdir` api from file manager external api': function (browser) {
+    browser
+    .addFile('mkdirFile.js', { content: executeMkdir })
+    .executeScript(`remix.exeCurrent()`)
+    .pause(2000)
+    .waitForElementPresent('[data-id="treeViewLibrowser/Test_Folder"]')
+  },
+
+  'Should execute `readdir` api from file manager external api': function (browser) {
+    browser
+    .addFile('readdirFile.js', { content: executeReaddir })
+    .executeScript(`remix.exeCurrent()`)
+    .pause(2000)
+    .journalLastChildIncludes('Test_Folder isDirectory true')
+  },
+
+  'Should execute `remove` api from file manager external api': function (browser) {
+    browser
+    .addFile('removeFile.js', { content: executeRemove })
+    .executeScript(`remix.exeCurrent()`)
+    .pause(2000)
+    .waitForElementNotVisible('[data-id="treeViewLibrowser/old_contract.sol"]')
+    .end()
+  },
+
+  tearDown: sauce
+}
+
+const executeFile = `
+  const run = async () => {
+    const result = await remix.call('fileManager', 'file')
+
+    console.log(result)
+  }
+
+  run()
+`
+
+const executeExists = `
+  const run = async () => {
+    const result1 = await remix.call('fileManager', 'exists', 'browser/exists.js')
+    const result2 = await remix.call('fileManager', 'exists', 'browser/non-exists.js')
+
+    console.log('browser/exists.js ' + result1)
+    console.log('browser/non-exists.js ' + result2)
+  }
+
+  run()
+`
+
+const executeOpen = `
+  const run = async () => {
+    await remix.call('fileManager', 'open', 'browser/3_Ballot.sol')
+    const result = await remix.call('fileManager', 'file')
+
+    console.log(result)
+  }
+
+  run()
+`
+
+const executeWriteFile = `
+  const run = async () => {
+    await remix.call('fileManager', 'writeFile', 'browser/new_contract.sol', 'pragma solidity ^0.6.0')
+  }
+
+  run()
+`
+
+const executeReadFile = `
+  const run = async () => {
+    const result = await remix.call('fileManager', 'readFile', 'browser/new_contract.sol')
+
+    console.log(result)
+  }
+
+  run()
+`
+
+const executeCopyFile = `
+  const run = async () => {
+    await remix.call('fileManager', 'copyFile', 'browser/basic.sol', 'browser/new_contract.sol')
+    const result = await remix.call('fileManager', 'readFile', 'browser/new_contract.sol')
+
+    console.log(result)
+  }
+
+  run()
+`
+
+const executeRename = `
+  const run = async () => {
+    await remix.call('fileManager', 'rename', 'browser/new_contract.sol', 'browser/old_contract.sol')
+  }
+
+  run()
+`
+
+const executeMkdir = `
+  const run = async () => {
+    await remix.call('fileManager', 'mkdir', 'browser/Test_Folder/')
+  }
+
+  run()
+`
+
+const executeReaddir = `
+  const run = async () => {
+    const result = await remix.call('fileManager', 'readdir', 'browser/')
+
+    console.log('Test_Folder isDirectory ', result["Test_Folder"].isDirectory)
+  }
+
+  run()
+`
+
+const executeRemove = `
+  const run = async () => {
+    await remix.call('fileManager', 'remove', 'browser/old_contract.sol')
+  }
+
+  run()
+`